rs1126568

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM1

The NM_004168.4(SDHA):c.1799G>A(p.Arg600Gln) variant causes a missense change involving the alteration of a conserved nucleotide. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R600W) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000079 ( 0 hom., cov: 30)

Exomes 𝑓: 0.000034 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

SDHA
NM_004168.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1U:11B:1

Conservation

PhyloP100: 8.92

Publications

7 publications found

Variant links:

Genes affected

SDHA (HGNC:10680): (succinate dehydrogenase complex flavoprotein subunit A) This gene encodes a major catalytic subunit of succinate-ubiquinone oxidoreductase, a complex of the mitochondrial respiratory chain. The complex is composed of four nuclear-encoded subunits and is localized in the mitochondrial inner membrane. Mutations in this gene have been associated with a form of mitochondrial respiratory chain deficiency known as Leigh Syndrome. A pseudogene has been identified on chromosome 3q29. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jun 2014]

SDHA Gene-Disease associations (from GenCC):

hereditary pheochromocytoma-paraganglioma
Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet
pheochromocytoma/paraganglioma syndrome 5
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Illumina, Ambry Genetics, Labcorp Genetics (formerly Invitae)
mitochondrial complex II deficiency, nuclear type 1
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
neurodegeneration with ataxia and late-onset optic atrophy
Inheritance: AD Classification: STRONG, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics
Leigh syndrome
Inheritance: AR Classification: MODERATE Submitted by: Ambry Genetics, ClinGen
familial isolated dilated cardiomyopathy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
gastrointestinal stromal tumor
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
Leigh syndrome with leukodystrophy
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
mitochondrial complex II deficiency
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
dilated cardiomyopathy 1GG
Inheritance: AR Classification: LIMITED Submitted by: Ambry Genetics

SDHA links:

ENSG00000286001 (HGNC:):

ENSG00000286001 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM1

In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 35 uncertain in NM_004168.4

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004168.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
SDHA	NM_004168.4	MANE Select	c.1799G>A	p.Arg600Gln	missense	Exon 14 of 15	NP_004159.2
SDHA	NM_001294332.2		c.1655G>A	p.Arg552Gln	missense	Exon 13 of 14	NP_001281261.1
SDHA	NM_001330758.2		c.1556G>A	p.Arg519Gln	missense	Exon 12 of 13	NP_001317687.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
SDHA	ENST00000264932.11	TSL:1 MANE Select	c.1799G>A	p.Arg600Gln	missense	Exon 14 of 15	ENSP00000264932.6
ENSG00000286001	ENST00000651543.1		n.*532G>A		non_coding_transcript_exon	Exon 13 of 24	ENSP00000499215.1
ENSG00000286001	ENST00000651543.1		n.*532G>A		3_prime_UTR	Exon 13 of 24	ENSP00000499215.1

Frequencies

GnomAD3 genomes

AF:

0.0000791

AC:

AN:

151738

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000488

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000192

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000103

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000209

AC:

AN:

239052

AF XY:

0.0000155

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000112

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000186

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

Data not reliable, filtered out with message: AS_VQSR

AF:

0.0000345

AC:

AN:

1450124

Hom.:

Cov.:

AF XY:

0.0000403

AC XY:

AN XY:

720116

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.0000908

AC:

AN:

33046

American (AMR)

AF:

0.0000463

AC:

AN:

43242

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25838

East Asian (EAS)

AF:

0.0000506

AC:

AN:

39508

South Asian (SAS)

AF:

0.0000356

AC:

AN:

84326

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52706

Middle Eastern (MID)

AF:

0.000745

AC:

AN:

5370

European-Non Finnish (NFE)

AF:

0.0000316

AC:

AN:

1106154

Other (OTH)

AF:

0.0000167

AC:

AN:

59934

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.312

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Data not reliable, filtered out with message: AS_VQSR

AF:

0.0000790

AC:

AN:

151856

Hom.:

Cov.:

AF XY:

0.0000808

AC XY:

AN XY:

74278

show subpopulations

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.0000486

AC:

AN:

41122

American (AMR)

AF:

0.0000654

AC:

AN:

15286

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.000193

AC:

AN:

5186

South Asian (SAS)

AF:

0.000207

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10620

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000103

AC:

AN:

68030

Other (OTH)

AF:

0.00

AC:

AN:

2104

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0.00000000385652), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.358

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0000843

Hom.:

ExAC

AF:

0.0000247

AC:

ClinVar

ClinVar submissions as Germline

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (5)

Mitochondrial complex II deficiency, nuclear type 1 (2)

Dilated cardiomyopathy 1GG (1)

Dilated cardiomyopathy 1GG;C3279992:Pheochromocytoma/paraganglioma syndrome 5;C5543254:Neurodegeneration with ataxia and late-onset optic atrophy;C5700310:Mitochondrial complex II deficiency, nuclear type 1 (1)

Gastrointestinal stromal tumor (1)

Hereditary cancer-predisposing syndrome (1)

Pheochromocytoma/paraganglioma syndrome 5;C5700310:Mitochondrial complex II deficiency, nuclear type 1 (1)

SDHA-related disorder (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.97

BayesDel_addAF

Uncertain

0.044

BayesDel_noAF

Pathogenic

0.17

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.23

Eigen

Pathogenic

0.89

Eigen_PC

Pathogenic

0.76

FATHMM_MKL

Pathogenic

0.97

LIST_S2

Benign

0.43

M_CAP

Pathogenic

0.84

MetaRNN

Uncertain

0.58

MetaSVM

Uncertain

0.47

PhyloP100

8.9

PROVEAN

Benign

1.2

REVEL

Uncertain

0.52

Sift

Uncertain

0.0040

Sift4G

Uncertain

0.031

MutPred

0.49

Gain of MoRF binding (P = 0.0269)

MVP

0.97

ClinPred

0.64

GERP RS

4.0

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.8

Varity_R

0.75

Mutation Taster

=7/93

disease causing

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.24

Details are displayed if max score is > 0.2

DS_AG_spliceai

0.24

Position offset: 2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

ClinVar submissions as Germline

Computational scores

Splicing

Publications

Other links and lift over